What are some signs of structural instability in a collapsed building?

The presence of cracks, sagging beams, or unusual noises from a structure are clear indicators of potential structural instability. Cracks in walls or ceilings can signify shifts in a building's foundation or other load-bearing elements. Sagging beams may indicate that they are no longer properly supporting weight, which can lead to further collapse if not addressed. Unusual noises, such as creaking or popping sounds, can suggest movement within the structure, which also points to instability. Recognizing these signs is crucial for ensuring safety during rescue operations and for making informed decisions about the next steps to take in a collapsed building situation. This understanding is essential to maintain the safety of both rescuers and potential victims trapped within the building.